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The FMO Protein.

John M Olson1

  • 1Department of Biochemistry and Molecular Biology, Lederle Graduate Research Center, University of Massachusetts, Amherst, MA, 01003-4505, USA, jmo@biochem.umass.edu.

Photosynthesis Research
|December 6, 2005
PubMed
Summary
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The Fenna-Matthews-Olson (FMO) protein, crucial for energy transfer in green sulfur bacteria, has been extensively studied since its discovery in 1962. Research has elucidated its structure, function, and spectral properties, including exciton interactions.

Area of Science:

  • Biochemistry
  • Photosynthesis research
  • Protein structure and function

Background:

  • The Fenna-Matthews-Olson (FMO) protein is essential for light-harvesting complex (LHC) energy transfer in green sulfur bacteria.
  • It facilitates the transfer of excitation energy from the chlorosome antenna to the photosynthetic reaction center.

Purpose of the Study:

  • This article reviews the historical research on the FMO protein.
  • It highlights the author's specific contributions to understanding the FMO protein's properties and function.

Main Methods:

  • Spectroscopic analysis (absorption and circular dichroism) to study exciton interactions.
  • X-ray crystallography to determine the protein's three-dimensional structure.
  • Optical spectral simulations to validate structural and functional models.

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Main Results:

  • The FMO protein contains bacteriochlorophyll a molecules exhibiting significant exciton interactions.
  • Low-temperature spectra revealed a seven-fold exciton splitting of the Q(y) band.
  • The 1979 crystal structure revealed a trimeric protein with each subunit binding seven bacteriochlorophyll molecules.

Conclusions:

  • The FMO protein's structure and spectral properties have been well-characterized, explaining its role in efficient energy transfer.
  • Its location and C3 symmetry axis orientation in vivo are crucial for its function.
  • Potential relationships between the FMO protein and reaction center component PscA are suggested.